Hi! I'm so sorry you're going through this, especially with a newborn to look after. 🤍 I can only imagine how exhausting that must be.
My sister had sciatica a while back (not during pregnancy), and she saw Dr Colum Nolan, her spine doctor in Singapore. He really helped her, and she's doing much better now.
It might be worth getting it checked by a spine specialist, just to make sure it's nothing more serious. They can advise you on what's safe and suitable, whether it's medication, physiotherapy, or another treatment. I really hope you get some relief soon so you can enjoy this precious time with your little one. Take care! 💕